METHOD FOR RELOADING A SINGLE-FLUTE DRILL, AND SINGLE-FLUTE DRILL

Abstract

A method for reloading a single-flute drill comprising a shaft made of a hard metal and a drill head that is connected to the shaft and is made of a hard metal, is characterized by the following steps: removing a worn drill head from the shaft; integrally bonding a new drill head to the shaft.

Claims

1. Method for reloading a single-flute drill, comprising a shaft (110) consisting of a carbide and a drill head (120) connected to this and consisting of a carbide (120), characterised by the following steps: detaching a worn drill head (120) from the shaft (110); and integrally fixing a new drill head (120) to the shaft (110); wherein a soldering/adhesion hinge (170) is inserted in the shaft after detaching the worn drill head (120) from the shaft (110).

2. Method according to claim 1, wherein the integral bonding of the new drill head (120) to the shaft (110) takes place by soldering or adhesion.

3. Method according to claim 1, wherein the same carbide is used for the shaft (110) and the drill head (120).

4. (canceled)

5. Method according to claim 1, wherein inserting the soldering/adhesion hinge (170) in the shaft (110) takes place by grinding it in.

6. Method according to claim 1, wherein a mirror-inverted counter-piece relative to the soldering/adhesion hinge (170) is provided on the new drill head.

7. Method according to claim 6, wherein the soldering/adhesion hinge (170) and the counter-piece are formed in such a way that as large a connection surface as possible arises.

8. Single-flute drill comprising a shaft (110) and a drill head (120) able to be connected to the shaft (110) by a soldering/adhesion connection releasably, wherein the shaft (110) and the drill head (120) consist of a carbide, wherein a soldering/adhesion hinge (170) is provided in the shaft (110).

9. (canceled)

10. (canceled)

11. Single-flute drill according to claim 8, wherein the soldering/adhesion hinge (170) is substantially aligned in the axial direction of the shaft (110).

12. Single-flute drill according to claim 11, wherein a counter-piece (180) that is mirror-inverted relative to the soldering/adhesion hinge (170) is provided in the drill head.

13. Single-flute drill according to claim 12, wherein the soldering/adhesion hinge (170) and the mirror-inverted counter-piece (180) are formed in such way that as large a connection surface as possible arises.

14. Single-flute drill according to claim 13, wherein the soldering hinge (170) and the counter-piece (180) have a V-shaped form having an angle of the limiting surfaces of between 50° and 100°, in particular of 60° or 90°.

15. Single-flute drill according to claim 14, wherein the shaft (110) and the drill head (120) consist of the same carbide.

Description

SHORT DESCRIPTION OF THE DRAWING

[0009] Exemplary embodiments of the invention are depicted in the drawing.

[0010] FIG. 1 shows a schematic depiction of a single-flute drill according to the invention having a soldered clamping sleeve.

[0011] In FIG. 2, a carbide head blank is depicted which is used in the single-flute drill depicted in FIG. 1, and in

[0012] FIGS. 3a and 3b, respective front views of different exemplary embodiments of the carbide head blank depicted in FIG. 2 are depicted.

EXEMPLARY EMBODIMENTS OF THE INVENTION

[0013] A single-flute drill 100 depicted in FIG. 1 has a clamping element 105, for example. A shaft 110, also called a drill shaft, is connected to the clamping element 105 in one piece. At this point it should be highlighted that such a clamping element 105 is optional. It is also possible to clamp an all-carbide single-flute drill directly on the shaft. A drill head 120 is connected to the drill shaft 110 in one piece, said drill head having a cutting edge on its front end. A tension nut 150 is arranged both in the shaft 110 and in the drill head 120. An inner cooling channel 140, 140″ (FIGS. 3a and 3b) is provided in the drill head 120 and in the shaft 110. The shavings produced by the metal shaving are washed out of the drill hole by the straight tension nut 10 via a cooling agent supplied with high pressure to the inner cooling channel 140, 140″. The inner cooling channel 140, 140″ can have the shape of a kidney (FIG. 3a). By doing so, a large amount of cooling agent and a good inner cooling are achieved with a negligible weakening of material. The inner cooling channel 140″ can also have a two-hole shape, as is depicted in FIG. 3b.

[0014] There are now soldered single-flute drills having a steel shaft, for example single-flute drills of the kind 110 of the applicant. All-carbide single-flute drills, for example of the kind 113 of the applicant, are used in particularly high load. Such all-carbide single-flute drills are usually implemented as a component. If the drill head is worn, it is reground. This is, however, only possible for a limited amount, since every grinding process shortens the drill head 120. When regrinding is no longer possible, the total single-flute drill becomes unusable and has to be thrown away. The method according to the invention now provides detaching the drill head 120 from the shaft 110 if it is worn, for example firstly by sawing off. After this, a soldering hinge 170 is inserted in the shaft 110. The soldering hinge 170 is inserted in the shaft 110 by grinding it in, for example. For this purpose, a mirror-inverted counter-piece 180 relative to the soldering hinge 170 is arranged in the drill head 120. Thus, the soldering hinge 170 and counter-piece 180 are formed in such a way that as large a surface as possible arises. The soldering hinge 170 and the corresponding counter-piece 180 have a V-shaped form, for example, wherein an angle of the two V-surfaces of the soldering hinge between 50.sup.0 and 100 are used (see FIG. 3a: 60°, FIG. 3b: 90°). The “V” is thus aligned in the axial direction with its tip pointing towards the clamping element 105.

[0015] A corresponding adhesion hinge can also be provided instead of the soldering hinge 170 having the corresponding counter-piece. In this case, the drill head 120 and shaft 110 are adhered to each other.

[0016] After this, a new drill head 120 is applied to the drill shaft 110, for example by inductive hard-soldering or adhesion. The drill head 120 and the shaft 110 are connected to each other in one piece in this way; they consist of the same carbide. The advantage of this is that the drill head 120 can be detached from the drill shaft 110 and a new drill head 120 can be newly soldered or adhered to the shaft 110. The drill head 120 is therefore connected to the drill shaft 110 with an integral bond and able to be detached. In terms of the present application, able to be detached thus means that it is once again fixed to the drill shaft 110 after removal from the drill shaft 110 and after introducing a soldering hinge/adhesion hinge into the drill shaft 110, for example by inductive hard-soldering/adhesion.

[0017] Such a single-flute drill and a method for its production are very advantageous, in particular both in terms of saving material and in terms of ecological and therefore, in the long run, economic aspects. The “lifetime” of such a single-flute drill that consists of a single carbide is thus considerably extended in this way by a removal the worn drill head 120 from the shaft 110 taking place and newly mounting a new drill head 120 on the existing shaft 110 being carried out.